Antibacterial activity of two chitosan solutions and their effect on rice bacterial leaf blight and leaf streak

2012 ◽  
Vol 69 (2) ◽  
pp. 312-320 ◽  
Author(s):  
Bin Li ◽  
Baoping Liu ◽  
Changlin Shan ◽  
Muhammad Ibrahim ◽  
Yihan Lou ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Leaf Blight ◽  
Bacterial Leaf Blight

scholarly journals Ginger Essential Oils-Loaded Nanoemulsions: Potential Strategy to Manage Bacterial Leaf Blight Disease and Enhanced Rice Yield

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 3902
Author(s):  
Abdullahi Adamu ◽  
Khairulmazmi Ahmad ◽  
Yasmeen Siddiqui ◽  
Intan Safinar Ismail ◽  
Norhayu Asib ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Electron Microscope ◽  
Essential Oils ◽  
Disease Severity ◽  
Rice Yield ◽  
Cell Structure ◽  
Leaf Blight ◽  
Bacterial Leaf Blight ◽  
Control Treatment ◽  
Promising Alternative

The bacterial leaf blight (BLB) caused by Xanthomonas oryzae pv. oryzae (Xoo) is one of the most serious rice diseases, causing huge yield losses worldwide. Several technologies and approaches have been opted to reduce the damage; however, these have had limited success. Recently, scientists have been focusing their efforts on developing efficient and environmentally friendly nanobactericides for controlling bacterial diseases in rice fields. In the present study, a scanning electron microscope (SEM), transmission electron microscope (TEM), and a confocal laser scanning microscope (CLSM) were utilized to investigate the mode of actions of ginger EOs on the cell structure of Xoo. The ginger EOs caused the cells to grow abnormally, resulting in an irregular form with hollow layers, whereas the dimethylsulfoxide (DMSO) treatment showed a typical rod shape for the Xoo cell. Ginger EOs restricted the growth and production of biofilms by reducing the number of biofilms generated as indicated by CLSM. Due to the instability, poor solubility, and durability of ginger EOs, a nanoemulsions approach was used, and a glasshouse trial was performed to assess their efficacy on BLB disease control. The in vitro antibacterial activity of the developed nanobactericides was promising at different concentration (50–125 µL/mL) tested. The efficacy was concentration-dependent. There was significant antibacterial activity recorded at higher concentrations. A glasshouse trial revealed that developed nanobactericides managed to suppress BLB disease severity effectively. Treatment at a concentration of 125 μL/mL was the best based on the suppression of disease severity index, AUDPC value, disease reduction (DR), and protection index (PI). Furthermore, findings on plant growth, physiological features, and yield parameters were significantly enhanced compared to the positive control treatment. In conclusion, the results indicated that ginger essential oils loaded-nanoemulsions are a promising alternative to synthetic antibiotics in suppressing Xoo growth, regulating the BLB disease, and enhancing rice yield under a glasshouse trial.

scholarly journals Synthesis and Antibacterial Evaluation of Novel 1,3,4-Oxadiazole Derivatives Containing Sulfonate/Carboxylate Moiety

Molecules ◽  
2020 ◽  
Vol 25 (7) ◽  
pp. 1488
Author(s):  
Lei Wang ◽  
Xia Zhou ◽  
Hui Lu ◽  
Xianfu Mu ◽  
Linhong Jin
Keyword(s):  
Antibacterial Activity ◽  
Inhibitory Effect ◽  
Sem Analysis ◽  
Leaf Blight ◽  
Xanthomonas Oryzae ◽  
Bacterial Leaf Blight ◽  
Xanthomonas Axonopodis ◽  
Better Than

In order to discover new lead compounds with high antibacterial activity, a series of new derivatives were designed and synthesized by introducing a sulfonate or carboxylate moiety into the 1,3,4-oxadiazole structure. Antibacterial activity against two phytopathogens, Xanthomonas oryzae pv. oryzae (Xoo) and Xanthomonas axonopodis pv. citri (Xac), was assayed in vitro. The preliminary results indicated that ten compounds including 4a-1-4a-4 and 4a-11-4a-16 had good antibacterial activity against Xoo, with EC50 values ranging from 50.1-112.5 µM, which was better than those of Bismerthiazol (253.5 µM) and Thiodiazole copper (467.4 µM). Meanwhile, 4a-1, 4a-2, 4a-3 and 4a-4 demonstrated good inhibitory effect against Xanthomonas axonopodis pv. citri with EC50 values around 95.8-155.2 µM which were better than those of bismerthiazol (274.3 µM) and thiodiazole copper (406.3 µM). In addition, in vivo protection activity of compound 4a-2 and 4a-3 against rice bacterial leaf blight was 68.6% and 62.3%, respectively, which were better than bismerthiazol (49.6%) and thiodiazole copper (42.2%). Curative activity of compound 4a-2 and 4a-3 against rice bacterial leaf blight was 62.3% and 56.0%, which were better than bismerthiazol (42.9%) and thiodiazole copper (36.1%). Through scanning electron microscopy (SEM) analysis, it was observed that compound 4a-2 caused the cell membrane of Xanthomonas oryzae pv. oryzae ruptured or deformed. The present results indicated novel derivatives of 5-phenyl sulfonate methyl 1,3,4-oxadiazole might be potential antibacterial agents.

scholarly journals Antibacterial Activity and Mechanism of Action of Sulfone Derivatives Containing 1,3,4-Oxadiazole Moieties on Rice Bacterial Leaf Blight

Molecules ◽  
2015 ◽  
Vol 20 (7) ◽  
pp. 11660-11675 ◽  
Author(s):  
Li Shi ◽  
Pei Li ◽  
Wenli Wang ◽  
Manni Gao ◽  
Zengxue Wu ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Mechanism Of Action ◽  
Leaf Blight ◽  
Bacterial Leaf Blight ◽  
Sulfone Derivatives

Evaluation of Improvement Effect of Restorer Lines on Pyramiding Genes Re-sistant to Rice Blast, Bacterial Leaf Blight and Brown Planthopper

2016 ◽  
Vol 42 (1) ◽  
pp. 31 ◽  
Author(s):  
Jue LOU ◽  
Wen-Qing YANG ◽  
Zhong-Xing LI ◽  
Tian-Kuan LUO ◽  
Yong-Chu XIE ◽  
...  
Keyword(s):  
Rice Blast ◽  
Brown Planthopper ◽  
Leaf Blight ◽  
Bacterial Leaf Blight ◽  
Improvement Effect
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